Multiple reasons:
If a felony charge is plea bargained down to a misdemeanor, it gets reported that way
https://www.newsweek.com/fbi-crime-data-violence-biden-trump-1911383
Plus the FBI changed their reporting system in 2021 (conveniently) and many police departments are not using it, and thus not reporting their crime stats. For example, LAPD and NYPD did not report in 2022, which makes the stats worthless.
https://www.themarshallproject.org/2023/07/13/fbi-crime-rates-data-gap-nibrs
How to stop a crime wave:
Enforcement of the law, stop reporting the crimes, or reduce the charges so things look better. We know what’s going on.